/* 基础样式 */
body {
    font-family: 'Segoe UI', sans-serif;
    overflow-x: hidden;
}

/* 侧边栏样式 */
.sidebar {
    min-height: 100vh;
    width: 250px;
    background-color: #2c3e50;
    color: white;
    transition: all 0.3s ease;
}

.sidebar.collapsed {
    width: 80px;
}

.sidebar .nav-link {
    color: rgba(255, 255, 255, 0.8);
    padding: 1rem 1.5rem;
    transition: all 0.2s;
}

.sidebar .nav-link:hover, .sidebar .nav-link.active {
    background-color: #34495e;
    color: white;
}

.sidebar .nav-link i {
    margin-right: 10px;
    width: 20px;
    text-align: center;
}

.sidebar.collapsed .nav-text {
    display: none;
}

.sidebar.collapsed .nav-link {
    padding: 1rem;
    text-align: center;
}

.sidebar.collapsed .nav-link i {
    margin-right: 0;
    font-size: 1.2rem;
}

/* 主内容区样式 */
.main-content {
    flex: 1;
    transition: all 0.3s ease;
}

.sidebar.collapsed ~ .main-content {
    margin-left: 80px;
}

/* 顶部导航样式 */
.top-nav {
    background-color: white;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    z-index: 100;
}

/* 数据卡片样式 */
.stat-card {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

/* 上传按钮样式 */
.upload-btn-wrapper {
    position: relative;
    overflow: hidden;
    display: inline-block;
}

.upload-btn-wrapper input[type=file] {
    position: absolute;
    left: 0;
    top: 0;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
}